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Females can reach a body length of 9–11 mm (0.35–0.43 in), males can reach a length of 8–9 mm (0.31–0.35 in). The female is light yellowish, with a very white cephalus and red rings surrounding the narrow black rings round the eyes. Two longitudinal bright red stripes are present on the opisthosoma.[3] The male is very dark, with white markings, and red hairs around the eyes. They appear in Singapore, Indonesia, Pakistan, Iran, India, and Bhutan. T. dimidiata is non-venomous and produces no toxin significant to humans.

Since 1999, the spider has been the subject of an email hoax claiming that it was a fatal spider found lurking under toilet seats in North Florida.[4] This hoax was a rehashing of an older email circulated in 1999 with similar claims, except under the name "South American Blush Spider (arachnius gluteus [sic])" - literally "butt spider". Similar email hoaxes (with details of the original changed) occurred in other parts of the world, alleging the same falsity in the recipients' countries. Lately[when?] it has also appeared on Facebook, also including a picture of the arachnid. Posts commonly report of it being found world-round, suggesting everyone must take precautions.[5] No such events appear to have occurred, and the story is considered an urban legend.[6][7][8] The false rumor has since spread to websites such as Twitter, Facebook and Tumblr in 2012.